by this passage in Numbers are associated with different types of spatial information depending on the task van Dijck, Gevers and Fiasa
"When patients neglecting the left side of perceptual space bisect physical lines, they typically shift the subjective midpoint towards the right. Similarly, when indicating the midpoint of a numerical interval (e.g. what is in the middle between 1 and 9?) they overestimate the midpoint (e.g. 7)."